How to measure salt?

[Notsolostfish]

Is there anything they sell i can measure my salt for my tank. First time filling.

 

[Reeferbadness]

Hanna Salinity Checker is my favorite - it's digital, it's portable and easy to use and calbrate and won't break the bank. Milwaukee also makes a digital refractometer but it's definitely not as user friendly and costs a bit more than the hanna. Deets here: https://www.hannainst.com/marine-salinity-tester-hi98319.html

 

[Floyd-]

I also use the Hanna checker for temp and salinity.
If you mean how to measure the salt to put into the RODI water for the mix, then some people use scales. I myself just use a standard measuring cup and measure it out and then check after to ensure no mix ups.